The band gap of GaN under uniaxial-strain compression was determined using time-resolved optical transmission measurements in shock-wave experiments. Shock waves were generated by impacting the GaN samples with c-cut sapphire impactors mounted on projectiles fired by a gas gun. Impact velocities were varied to provide longitudinal stresses ranging from 4.5 to 13 GPa. An abrupt increase of the band gap is observed upon shock-wave compression, followed by a slower increase. By measuring the absorption threshold before and during shock compression of the GaN layer, the band-gap shift for a particular longitudinal stress was obtained. A linear fit to the data yields a band-gap shift of 0.02 eV/GPa. Comparison with ab initio calculations show that this slope lies between the calculated bounds for isotropic and uniaxial compression. Potential reasons for the differences are indicated.
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18 March 2002
Research Article|
March 18 2002
Band gap changes of GaN shocked to 13 GPa
M. D. McCluskey;
M. D. McCluskey
Institute for Shock Physics and Department of Physics, Washington State University, Pullman, Washington 99164-2816
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Y. M. Gupta;
Y. M. Gupta
Institute for Shock Physics and Department of Physics, Washington State University, Pullman, Washington 99164-2816
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C. G. Van de Walle;
C. G. Van de Walle
Xerox PARC, 3333 Coyote Hill Rd., Palo Alto, California 94304
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D. P. Bour;
D. P. Bour
Xerox PARC, 3333 Coyote Hill Rd., Palo Alto, California 94304
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M. Kneissl;
M. Kneissl
Xerox PARC, 3333 Coyote Hill Rd., Palo Alto, California 94304
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N. M. Johnson
N. M. Johnson
Xerox PARC, 3333 Coyote Hill Rd., Palo Alto, California 94304
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Appl. Phys. Lett. 80, 1912–1914 (2002)
Article history
Received:
October 24 2001
Accepted:
December 19 2001
Citation
M. D. McCluskey, Y. M. Gupta, C. G. Van de Walle, D. P. Bour, M. Kneissl, N. M. Johnson; Band gap changes of GaN shocked to 13 GPa. Appl. Phys. Lett. 18 March 2002; 80 (11): 1912–1914. https://doi.org/10.1063/1.1455148
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